docs: Provide xref for piece specs

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/docs/gamespec.rst b/docs/gamespec.rst
index a47e3672b6f2a9d278b41caf9523fa1debf13b19..5090b0f9015b313e16f8237aca5c153150088a03 100644 (file)
--- a/docs/gamespec.rst
+++ b/docs/gamespec.rst
@@ -71,6 +71,8 @@ For examples, see the built-in game specs.
 
 .. _the Tera documentation: https://tera.netlify.app/docs/#templates
 
+.. _piece-specs:
+
 Piece Specs
 -----------